LES-DFSD studies of lean-burn turbulent premixed hydrogen flames

Large eddy simulation (LES) based turbulence modelling technique may face challenges when employed to predict turbulent reacting flows. The Dynamic Flame Surface Density (DFSD) model for turbulent premixed combustion applied in this research adapts to produce accurate results based on the informatio...

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Main Authors:	Mohamed Elshimy, Salah Ibrahim, Weeratunge Malalasekera
Format:	Default Conference proceeding
Published:	2021
Subjects:	Large eddy simulation Hydrogen combustion Computational fluid dynamics Area blockage ratio
Online Access:	https://hdl.handle.net/2134/14811633.v1
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id	rr-article-14811633
record_format	Figshare
spelling	rr-article-148116332021-06-21T09:15:17Z LES-DFSD studies of lean-burn turbulent premixed hydrogen flames Mohamed Elshimy (5804771) Salah Ibrahim (1250199) Weeratunge Malalasekera (1258755) Large eddy simulation Hydrogen combustion Computational fluid dynamics Area blockage ratio Large eddy simulation (LES) based turbulence modelling technique may face challenges when employed to predict turbulent reacting flows. The Dynamic Flame Surface Density (DFSD) model for turbulent premixed combustion applied in this research adapts to produce accurate results based on the information obtained from transient flames. A LES – DFSD model has been developed and validated against experimental data for lean-burn premixed hydrogen flames propagating past repeated obstacles and a solid obstruction of varied area blockage ratio (ABR). The rate of pressure rise, peak overpressure magnitude, flame speed and other flame characteristics have been successfully reproduced numerically for flow configurations. It was found that having a combustion filter-width which is 6 to 7 times the smallest computational grid cell size produced the best overpressure and flame speed results. The numerical results from the LES – DFSD co-simulations produced good agreement with available experimental data. 2021-06-21T09:15:17Z Text Conference contribution 2134/14811633.v1 https://figshare.com/articles/conference_contribution/LES-DFSD_studies_of_lean-burn_turbulent_premixed_hydrogen_flames/14811633 CC BY-NC-ND 4.0
institution	Loughborough University
collection	Figshare
topic	Large eddy simulation Hydrogen combustion Computational fluid dynamics Area blockage ratio
spellingShingle	Large eddy simulation Hydrogen combustion Computational fluid dynamics Area blockage ratio Mohamed Elshimy Salah Ibrahim Weeratunge Malalasekera LES-DFSD studies of lean-burn turbulent premixed hydrogen flames
description	Large eddy simulation (LES) based turbulence modelling technique may face challenges when employed to predict turbulent reacting flows. The Dynamic Flame Surface Density (DFSD) model for turbulent premixed combustion applied in this research adapts to produce accurate results based on the information obtained from transient flames. A LES – DFSD model has been developed and validated against experimental data for lean-burn premixed hydrogen flames propagating past repeated obstacles and a solid obstruction of varied area blockage ratio (ABR). The rate of pressure rise, peak overpressure magnitude, flame speed and other flame characteristics have been successfully reproduced numerically for flow configurations. It was found that having a combustion filter-width which is 6 to 7 times the smallest computational grid cell size produced the best overpressure and flame speed results. The numerical results from the LES – DFSD co-simulations produced good agreement with available experimental data.
format	Default Conference proceeding
author	Mohamed Elshimy Salah Ibrahim Weeratunge Malalasekera
author_facet	Mohamed Elshimy Salah Ibrahim Weeratunge Malalasekera
author_sort	Mohamed Elshimy (5804771)
title	LES-DFSD studies of lean-burn turbulent premixed hydrogen flames
title_short	LES-DFSD studies of lean-burn turbulent premixed hydrogen flames
title_full	LES-DFSD studies of lean-burn turbulent premixed hydrogen flames
title_fullStr	LES-DFSD studies of lean-burn turbulent premixed hydrogen flames
title_full_unstemmed	LES-DFSD studies of lean-burn turbulent premixed hydrogen flames
title_sort	les-dfsd studies of lean-burn turbulent premixed hydrogen flames
publishDate	2021
url	https://hdl.handle.net/2134/14811633.v1
_version_	1797367990815031296

LES-DFSD studies of lean-burn turbulent premixed hydrogen flames

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